Altera Virtual JTAG IP Core - Manual (Page 16)

Table 7: Tcl Commands Used with the Virtual JTAG Megafunction
Description Arguments Command
Perform an IR shift operation to the
virtual JTAG instance specified by
the
instance_index . Note that ir_
value
takes a numerical argument.
-instance_index <instance_index>
-ir_value
<numeric_ir_value>
-no_captured_ir_value
(1)
-show_equivalent_device_ir_dr_shift
(1)
Device virtual ir shift
Perform a DR shift operation to the
virtual JTAG instance.
-instance_index
<instance_index>
-dr_value
<dr_value>
-length
<data_register_length>
-no_captured_dr_value
(1)
-show_equivalent_device_ir_dr_shift
-value_in_hex
(1)
Device virtual dr shift
Queries for all available program-
ming cables. NONE Get hardware names
Selects the active device on the
JTAG chain.
-device_name
<device_name>
-hardware_name
<hardware_name>
Open device
Ends communication with the active
JTAG device. NONE Close device
Obtains exclusive communication
to the JTAG chain.
-timeout
<timeout> Device lock
Releases
device_lock
. NONE Device unlock
Performs a IR shift operation.
-ir_value
<ir_value>
-no_captured_ir_value
Device ir shift
Performs a DR shift operation. -dr_value <dr_value>
-length
<data register length>
-no_captured_dr_value
-value_in_hex
Device dr shift
Central to virtual JTAG megafunction are the device_virtual_ir_shift and device_virtual_dr_shift
commands. These commands perform the shift operation to each VIR/VDR and provide the address to the
SLD hub for the active JTAG datapath.
(1) This argument is optional.
Virtual JTAG Megafunction (sld_virtual_jtag) Altera Corporation
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Run-Time Communication with the Virtual JTAG Megafunction 16
2014.03.19